Embedding Information into Objects Fabricated With 3-D Printers by Forming Fine Cavities inside Them. - Masahiro Suzuki 003; Pailin Dechrueng; Soravit Techavichian; Piyarat Silapasuphakornwong; Hideyuki Torii; Kazutake Uehira (Media Watermarking, Security, and Forensics, 2017)